Current Electricity Test

Result

Current Electricity Test - 84

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes

A

B

C

D

Solution
Question 2
4 / -1

The resistance of a conductor is 5 ohm at 50°C and6 ohm at 100°C. Its resistance at 0°C is

A
1 ohm

B
2 ohm

C
3 ohm

D
4 ohm

Solution
Question 3
4 / -1

Equal potentials are applied on an iron and copper wire of same length. In order to have the same current flow in the two wires, the ratio r (iron)/r (copper) of their radii must be (Given that specific resistance of iron = 1.0 × 10^–7ohm–m and specific resistance of copper= 1.7 × 10^–8 ohm-m)

A
About 1.2

B
About 2.4

C
About 3.6

D
About 4.8

Solution
Question 4
4 / -1

An electron (charge = 1.6 × 10^–19 coulomb) is moving in a circle of radius 5.1 × 10^–11m at a frequency of 6.8 × 10¹² revolutions/sec. The equivalent current isapproximately

A
5.1 × 10^–13 amp

B
6.8 ×10^–3 amp

C
1.1 × 10^–3 amp

D
2.2 ×10^–3 amp

Solution
Question 5
4 / -1

At what temperature will the resistance of a copper wire become three times its value at 0°C (Temperature coefficient of resistance for copper = 4 ×10^–3 per ° C )?

A
400°C

B
450°C

C
500°C

D
550°C

Solution
Question 6
4 / -1

If potential v = 100 ± 0.5 Volt and current I = 10 ± 0.2 amp are given to us, then what will be the value of resistance?

A
10 ± 0.7 ohm

B
5 ± 2 ohm

C
0.1 ± 0.2ohm

D
None of these

Solution
Question 7
4 / -1

A nichrome wire 50 cm long and one square millimetre cross-section carries a current of 4A when connected to a 2V battery. The resistivity of nichrome wire in ohm metre is

A
1× 10^–6

B
4 × 10^–7

C
3 × 10^–7

D
2 × 10^–7

Solution
Question 8
4 / -1

If an observer is moving with respect to a stationaryelectron, then he observes

A
Only magnetic field

B
Only electric field

C
Both (a) and (b)

D
None of the above
Question 9
4 / -1

The drift velocity does not depend upon

A
Cross-section of the wire

B
Length of the wire

C
Number of free electrons

D
Magnitude of the current

Solution
Question 10
4 / -1

A

B

C

D

Solution